Precision CNC Turned D3 Die Steel Mold Parts | High-Gloss Mirror Finish

Product Overview

CNC lathed D3 die steel precision mould parts with mirror-polished surfaces are designed for injection molding applications requiring high wear resistance, dimensional stability, and superior surface finish. D3 cold work die steel provides excellent hardness and abrasion resistance, while mirror polishing supports smooth plastic flow and consistent part appearance. Senlan Precision manufactures all components strictly based on customer drawings under a built-to-print model.
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Key Features & Technical Advantages

• CNC lathing for high concentricity and dimensional accuracy

• D3 cold work die steel with high wear and abrasion resistance

• Mirror-polished surface to reduce plastic adhesion and flow marks

• Stable performance under long production cycles

• Tight tolerance control based on drawing requirements

• Fully customized manufacturing, no standard parts

Applications & Industry Use

• Injection mould components for bottle caps and closures

• Precision mould parts for packaging tooling

• Mold inserts requiring polished flow surfaces

• High-wear mould components for multi-cavity systems

• Custom mould parts for medical plastic tooling

Mold Structure & Design Description

These CNC lathed D3 die steel mould parts are commonly used as functional inserts or core-related components within injection moulds. The mirror-polished surface finish is applied to areas in contact with molten plastic to improve demolding behavior and reduce surface defects. Geometry, polishing grade, and functional surfaces are fully defined by customer drawings to ensure proper integration into existing mould structures.

Manufacturing Capability & CNC Machining

Senlan Precision operates precision machining and finishing equipment, including advanced systems from MAKINO (Japan) and HARDINGE (USA).

Manufacturing capabilities include:

• CNC lathing of hardened and pre-hardened die steel

• Precision grinding and mirror polishing processes

• Tight tolerance machining for rotational mould parts

• Consistent batch control for multi-cavity mould components

• Full drawing-based production with inspection records

Custom Development & OEM Cooperation

All products are supplied under OEM / Built-to-Print cooperation.

Standard workflow:

1. Customer drawing or 3D model submission

2. Technical feasibility and tolerance review

3. Material and heat treatment confirmation

4. CNC machining, polishing, and inspection

5. Packaging and shipment

Design ownership remains fully with the customer.

Quality Control & Export Experience

• Incoming inspection of D3 die steel material

• In-process dimensional and surface finish checks

• Final inspection using calibrated measuring equipment

• Surface quality verification for mirror-polished areas

• Stable export experience supporting international mould manufacturers

Related Products

• Precision mould core inserts and sleeves

• CNC machined mould components with polished surfaces

• Cold work die steel mould parts

• Custom multi-cavity mould components

Technical FAQ

Q1: Is this a standard mould part?
No. All parts are manufactured strictly according to customer drawings.

Q2: What polishing level can be achieved?
Mirror polishing level is defined per drawing and functional surface requirements.

Q3: Is D3 suitable for high-wear mould applications?
Yes. D3 die steel offers excellent wear resistance for long production cycles.

Q4: Can this part be used in medical moulds?
Yes, when specified by the customer and designed accordingly.

Request a Quote

Please submit your technical drawings and specifications to receive a quotation.
Our engineering team will review the design and provide machining feedback accordingly.